Server application in TypeScript with Koa

index.spec.ts

// example code for this tutorial: https://jumplink.eu/blog/post/serveranwendung-direkt-typescript-entwickeln-und-testen

import 'mocha';
import ChaiHttp = require('chai-http');
import * as chai from 'chai';

chai.use(ChaiHttp);

describe('test route', function() {
  it('should response with status 200', function(done) {
    chai.request('http://localhost:3000')
    .get('/')
    .end((err, res) => {
      chai.expect(err).to.be.null;
      chai.expect(res).to.have.status(200);
      done(err);
    });
  });
  it('should response Hello World', function(done) {
    chai.request('http://localhost:3000')
    .get('/')
    .end((err, res) => {
      chai.expect(res).to.be.text;
      chai.assert.equal(res.text, 'Hello World');
      done(err);
    });
  });
});

index.ts

import * as Koa from 'koa';

const app = new Koa();

app.use(async ctx => {
  ctx.body = 'Hello World';
});

app.listen(3000);

package.json

{
  "name": "typescript-test",
  "version": "1.0.0",
  "description": "Beispielprojekt für eine Serveranwendung in TypeScript",
  "main": "index.ts",
  "author": "Pascal Garber",
  "license": "MIT",
  "scripts": {
    "start": "ts-node index.ts",
    "test": "mocha -r ts-node/register **/*.spec.ts",
    "watch": "nodemon -e ts -x 'npm run start'",
    "watch-test": "nodemon -e ts -x 'npm run test'"
  },
  "dependencies": {
    "@types/chai": "^4.0.10",
    "@types/chai-http": "^3.0.3",
    "@types/koa": "^2.0.43",
    "@types/mocha": "^2.2.45",
    "chai": "^4.1.2",
    "chai-http": "^3.0.0",
    "koa": "^2.4.1",
    "mocha": "^4.0.1",
    "nodemon": "^1.14.3",
    "ts-node": "^4.1.0",
    "typescript": "^2.6.2"
  }
}